ssh - add new package ssh managing ssh & scp

go.mod

@@ -12,4 +12,8 @@ require (
 	gopkg.in/yaml.v3 v3.0.1
 )
 
-require github.com/xo/terminfo v0.0.0-20210125001918-ca9a967f8778 // indirect
+require (
+	github.com/kr/fs v0.1.0 // indirect
+	github.com/pkg/sftp v1.13.6 // indirect
+	github.com/xo/terminfo v0.0.0-20210125001918-ca9a967f8778 // indirect
+)

go.sum

@@ -1,21 +1,61 @@
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 github.com/go-sql-driver/mysql v1.7.1 h1:lUIinVbN1DY0xBg0eMOzmmtGoHwWBbvnWubQUrtU8EI=
 github.com/go-sql-driver/mysql v1.7.1/go.mod h1:OXbVy3sEdcQ2Doequ6Z5BW6fXNQTmx+9S1MCJN5yJMI=
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+github.com/kr/fs v0.1.0 h1:Jskdu9ieNAYnjxsi0LbQp1ulIKZV1LAFgK1tWhpZgl8=
+github.com/kr/fs v0.1.0/go.mod h1:FFnZGqtBN9Gxj7eW1uZ42v5BccTP0vu6NEaFoC2HwRg=
+github.com/pkg/sftp v1.13.6 h1:JFZT4XbOU7l77xGSpOdW+pwIMqP044IyjXX6FGyEKFo=
+github.com/pkg/sftp v1.13.6/go.mod h1:tz1ryNURKu77RL+GuCzmoJYxQczL3wLNNpPWagdg4Qk=
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+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
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 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
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 github.com/ulikunitz/xz v0.5.11/go.mod h1:nbz6k7qbPmH4IRqmfOplQw/tblSgqTqBwxkY0oWt/14=
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 github.com/xo/terminfo v0.0.0-20210125001918-ca9a967f8778/go.mod h1:2MuV+tbUrU1zIOPMxZ5EncGwgmMJsa+9ucAQZXxsObs=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/crypto v0.1.0/go.mod h1:RecgLatLF4+eUMCP1PoPZQb+cVrJcOPbHkTkbkB9sbw=
 golang.org/x/crypto v0.14.0 h1:wBqGXzWJW6m1XrIKlAH0Hs1JJ7+9KBwnIO8v66Q9cHc=
 golang.org/x/crypto v0.14.0/go.mod h1:MVFd36DqK4CsrnJYDkBA3VC4m2GkXAM0PvzMCn4JQf4=
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+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
+golang.org/x/net v0.1.0/go.mod h1:Cx3nUiGt4eDBEyega/BKRp+/AlGL8hYe7U9odMt2Cco=
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 golang.org/x/sys v0.14.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
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ssh/ssh.go

@@ -0,0 +1,166 @@
+package ssh
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"os"
+	"os/user"
+
+	"gitea.meta-tech.academy/go/core/echo"
+	"github.com/pkg/sftp"
+	"golang.org/x/crypto/ssh"
+	"golang.org/x/crypto/ssh/agent"
+	"golang.org/x/crypto/ssh/knownhosts"
+)
+
+type SshAuth struct {
+	Host string `yaml:"host"`
+	Type string `yaml:"type"`
+	Port int    `yaml:"port"`
+	User string `yaml:"user"`
+}
+
+type Ssh struct {
+	Config  *SshAuth
+	Client  *ssh.Client
+	Session *ssh.Session
+	bar     *io.Writer
+	withBar bool
+}
+
+func NewSsh(config *SshAuth) *Ssh {
+	s := &Ssh{Config: config, withBar: false}
+	s.InitDial()
+	return s
+}
+
+func (s *Ssh) initSession() {
+	var err error
+	s.Session, err = s.Client.NewSession()
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
+func (s *Ssh) AddBar(bar io.Writer) {
+	s.bar = &bar
+	s.withBar = true
+}
+
+func (s *Ssh) Exec(cmd string, close bool) *bytes.Buffer {
+	if close {
+		defer s.Client.Close()
+	}
+	s.initSession()
+	defer s.Session.Close()
+
+	var buff bytes.Buffer
+	s.Session.Stdout = &buff
+	if err := s.Session.Run(cmd); err != nil {
+		log.Fatal(err)
+	}
+	return &buff
+}
+
+func (s *Ssh) getHostKeyCB() ssh.HostKeyCallback {
+	user, err := user.Current()
+	if err != nil {
+		log.Fatalf(err.Error())
+	}
+	hkcb, err := knownhosts.New(fmt.Sprintf("/home/%s/.ssh/known_hosts", user.Username))
+	if err != nil {
+		panic(err)
+	}
+	//  return ssh.InsecureIgnoreHostKey()
+	return hkcb
+}
+
+func (s *Ssh) getSigners() []ssh.Signer {
+	sock, err := net.Dial("unix", os.Getenv("SSH_AUTH_SOCK"))
+	if err != nil {
+		log.Fatal(err)
+	}
+	agent := agent.NewClient(sock)
+	signers, err := agent.Signers()
+	if err != nil {
+		log.Fatal(err)
+	}
+	return signers
+}
+
+func (s *Ssh) InitDial() {
+	auths := []ssh.AuthMethod{ssh.PublicKeys(s.getSigners()...)}
+	cfg := &ssh.ClientConfig{
+		User:            s.Config.User,
+		Auth:            auths,
+		HostKeyCallback: s.getHostKeyCB(), // ssh.InsecureIgnoreHostKey(),
+	}
+	cfg.SetDefaults()
+	var err error
+	s.Client, err = ssh.Dial(s.Config.Type, fmt.Sprintf("%s:%d", s.Config.Host, s.Config.Port), cfg)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
+func (s *Ssh) Scp() *sftp.Client {
+	scp, err := sftp.NewClient(s.Client)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Unable to start SFTP subsystem: %v\n", err)
+		os.Exit(1)
+	}
+	return scp
+}
+
+func (s *Ssh) ScpDownload(size int64, remoteFile string, localFile string, close bool) bool {
+	var done bool = false
+	scp := s.Scp()
+	if close {
+		defer scp.Close()
+	}
+	if err := s.downloadFile(size, scp, remoteFile, localFile); err == nil {
+		done = true
+	} else {
+		log.Fatal(err)
+	}
+	return done
+}
+
+func (s *Ssh) downloadFile(size int64, sc *sftp.Client, remoteFile string, localFile string) (err error) {
+
+	// Note: SFTP To Go doesn't support O_RDWR mode
+	srcFile, err := sc.OpenFile(remoteFile, (os.O_RDONLY))
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Unable to open remote file: %v\n", err)
+		return
+	}
+	defer srcFile.Close()
+	fmt.Println()
+
+	dstFile, err := os.Create(localFile)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Unable to open local file: %v\n", err)
+		return
+	}
+	defer dstFile.Close()
+
+	if s.withBar {
+		_, err = io.Copy(io.MultiWriter(dstFile, *s.bar), srcFile)
+	} else {
+		_, err = io.Copy(dstFile, srcFile)
+	}
+
+	// s.bar.Clear()
+	// s.bar.Finish()
+	echo.LineUp(1)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Unable to download remote file: %v\n", err)
+		os.Exit(1)
+	}
+	// fmt.Fprintf(os.Stdout, "%d bytes copied\n", bytes)
+
+	return
+}